For my DRY tumbler, I used a 12 inch piece of 2 inch PVC. I put 4 fins inside made from 1 inch aluminum angle. Bolted in with machine screws. I have the 12 inch pipe mounted to the inside of an old clothes' dryer. Works real good. Been using it for about 15 years now--problem free. One day I will make a wet drum to try out. Plan to use something like nylon cutting boards cut round for end caps. I have another piece of the same 12inch PVC pipe to use. Will change up to steel fins(maybe). I always used to hide the vibrating tumbler outside because it was noisy. The clothes dryer model is actually quieter than drying clothes.
